文献类型： 外文期刊

第一作者： Liu, Junhao

作者： Liu, Junhao;Ma, Fengtao;Sun, Peng;Degen, Allan

作者机构：

关键词： calf health; growth performance; plasma trace elements; zinc oxide; zinc proteinate

期刊名称：ANIMALS （ 影响因子：3.0； 五年影响因子：3.2 ）

ISSN： 2076-2615

年卷期： 2023 年 13 卷 15 期

页码：

收录情况： SCI

摘要： Simple Summary Diarrhea is the most common disease in dairy calves and occurs frequently during the first month of life. It affects animal welfare and causes substantial economic losses. Zinc (Zn) is an essential nutrient element that can reduce the incidence of diarrhea. This study was designed to examine the effects of supplementary Zn proteinate (ZnPro, an organic zinc source) and Zn oxide (ZnO, an inorganic zinc source) on growth performance, diarrhea, antioxidant capacity, immune function, and mineral element concentrations of dairy calves during the first 28 days of life. Both ZnPro and ZnO reduced the bouts of diarrhea and promoted the immune function of calves, but ZnPro improved the growth performance and antioxidant capacity to a greater extent than ZnO. It was concluded that ZnPro is a better zinc source to improve calf health and performance than ZnO. The current study examined the effects of supplementary zinc proteinate (ZnPro) and zinc oxide (ZnO) on growth performance, diarrhea, antioxidant capacity, immune function, and mineral element concentrations of calves aged 1 to 28 days. A total of twenty-four newborn calves were divided randomly into 3 groups (n = 8; 2 males and 6 females per group), and each received: 0 mg/d Zn (CON), 627 mg/d ZnPro (80 mg/d Zn; ZnPro group), and 101 mg/d ZnO (80 mg/d Zn; ZnO group). The calves received the additive in their milk during the first 28 days of life. Compared with the CON group: ZnPro and ZnO improved average daily gain (ADG) and decreased the feed:gain ratio (FGR) between days 1 and 14 (p < 0.05), while the ADG increased and FGR decreased only in the ZnPro group between days 1 and 28 (p < 0.05). The incidence of diarrhea decreased (p < 0.05) in the ZnPro and ZnO groups between days 15 and 28 as well as days 1 and 28, but decreased (p < 0.05) only in the ZnPro group between days 1 and 14. The serum immunoglobulin G (IgG) concentration of the ZnPro and ZnO groups increased on days 14 and 28 (p < 0.05). ZnPro supplementation increased serum IgM concentration during the whole study, while ZnO enhanced serum IgM concentration only on day 14 (p < 0.05). In the ZnO group, the serum concentration of cytokines interleukin (IL)-10 increased on day 14, while that of IL-1 & beta; increased on day 28 (p < 0.05). In addition, ZnPro reduced the serum malondialdehyde (MDA) concentration on days 14 and 28 (p < 0.05). Both ZnPro and ZnO increased the serum concentrations of alkaline phosphatase (ALP) and metallothionein (MT) on day 14 (p < 0.05). With zinc supplementation, plasma Zn concentration increased (p < 0.05) on days 14 and 28 of age. We concluded that supplementary ZnPro and ZnO reduced incidences of diarrhea and promoted the immune function, but ZnPro improved the growth performance and antioxidant capacity of Holstein dairy calves to a greater extent.

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